管道沉降模式识别方法

Identification method of pipeline settlement pattern

管道沉降严重影响运营安全,评估管道安全的应力指标与沉降模式密切相关。管道发生沉降后,沉降管道的垂向位移量可采用水准仪测量,水平位移量却不便直接测量。只有获得沉降模式及两个方向的位移量后,方可制定沉降治理方案。该文提出一种基于有限元模型反求水平位移量的方法。采用超声残余应力测试系统获得管道的轴向应力,在已知的测试垂直位移量与假定的不同水平位移量组合下,利用有限元软件模拟管道的轴向应力,并与超声残余应力测试结果比较,确定管道的沉降模式及倾斜沉降的程度。以某储气库场站的沉降管道为例,详细论述沉降模式识别及其水平位移量反求的方法。

The pipeline settlement seriously affects its operation safety.The stress index of pipeline safety evaluation is closely related to the settlement model.After occurrence of pipeline settlement,the pipeline’s vertical displacement relative to supporter can be measured by level gauge,but horizontal displacement is not easy to measure.The settlement treatment scheme can be determined only after understanding the settlement mode of the pipeline and its displacement values at two directions.A reverse calculation method of the horizontal displacement based on a finite element model is proposed.The ultrasonic residual stress test method is applied to obtain the axial stress of pipeline,and under the combination of known vertical displacement and the supposed different horizontal displacements,utilizing the finite element software to simulate the axial stress of pipeline,and comparing it with the results of ultrasonic residual stress test,the settlement mode and inclined displacement level of the pipeline can be determined.Taking the pipeline settlement in a gas storage station as an example,the settlement mode recognition and its horizontal displacement reverse calculation method are described in details.